Etymologies

From sell + -er. (Wiktionary)

Alternative forms. (Wiktionary)

Examples

Beyond all other men, he knows when to talk, and when to refrain from talking, -- how to throw the burden of negotiation on the seller, -- how to get the goods he wants at his own price, not at _his_ asking, but on _the suggestion of the seller_, prompted by his own politely obvious unwillingness to have the seller part with his merchandise at any price not entirely acceptable to himself.